What happens when the Unstoppable Juggernaut gets one of the most incredible cosmic powers in the Marvel Universe? He saves the Earth, of course. Cain Marko once gained the powers of the Uni-Power from the Enigma Force, briefly becoming Captain Universe as the world beneath him was starting to split. In a moment that showed why he should be considered one of Earth's greatest heroes and not a villain, Juggernaut used his newfound powers to fix shifting faults, proving that with great cosmic power comes great responsibility.
The Uni-Power is one of the most potent cosmic abilities someone can be granted in all of Marvel Comics. Derived from the Engima Force, the Uni-Power gives its chosen host a special cosmic awareness while specifically adapting to the previous powers of whoever is the new Captain Universe. The Uni-Power also gives the power of atomic manipulation. Basically, its cosmic powers are near-immeasurable and whoever has them is one of the most powerful beings in existence. Heroes who have hosted the Uni-Power include Miles Morales and Peter Parker, Silver Surfer, Doctor Strange, and perhaps most famously, Eddie Brock's Venom becoming the God of Light with the cosmic abilities in the King in Black saga. The Enigma Force often chooses heroes to wield the Uni-Power, but once, they asked Juggernaut to take on the role of Captain Universe, briefly making him one of Marvel's greatest heroes.
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In The Amazing Spider-Man #627-629 by Roger Stern, Lee Weeks, Dean White, Matt Hollingsworth, and VC's Joe Caramagna, a battle between a new Captain Universe and the Juggernaut ends with the latter being knocked into a coma. The current wielder of
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